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FAIR VALUE MEASUREMENTS - Fair value of assets measured on a recurring basis (Details) - USD ($) $ in Thousands | Sep. 30, 2023 | Dec. 31, 2022 | Dec. 31, 2021
--- | --- | --- | ---
Assets |  |  |
Mortgage servicing rights | $ 13,733 | $ 9,582 | $ 5,016
Recurring |  |  |
Assets |  |  |
Mortgage servicing rights | 13,733 | 9,582 |
Recurring | U.S. Treasury securities |  |  |
Assets |  |  |
Securities available for sale | 41,835 | 142,097 |
Recurring | Obligations of U.S. Government sponsored agencies |  |  |
Assets |  |  |
Securities available for sale | 27,780 | 21,749 |
Recurring | Obligations of states and political subdivisions |  |  |
Assets |  |  |
Securities available for sale | 54,121 | 83,186 |
Recurring | Mortgage-backed securities |  |  |
Assets |  |  |
Securities available for sale | 35,840 | 36,637 |
Recurring | Corporate notes |  |  |
Assets |  |  |
Securities available for sale | 18,738 | 19,994 |
Recurring | Certificates of deposit |  |  |
Assets |  |  |
Securities available for sale | 732 | 974 |
Recurring | Level 2 |  |  |
Assets |  |  |
Mortgage servicing rights | 13,733 | 9,582 |
Recurring | Level 2 | U.S. Treasury securities |  |  |
Assets |  |  |
Securities available for sale | 41,835 | 142,097 |
Recurring | Level 2 | Obligations of U.S. Government sponsored agencies |  |  |
Assets |  |  |
Securities available for sale | 27,780 | 21,749 |
Recurring | Level 2 | Obligations of states and political subdivisions |  |  |
Assets |  |  |
Securities available for sale | 54,121 | 83,186 |
Recurring | Level 2 | Mortgage-backed securities |  |  |
Assets |  |  |
Securities available for sale | 35,840 | 36,637 |
Recurring | Level 2 | Corporate notes |  |  |
Assets |  |  |
Securities available for sale | 18,738 | 19,994 |
Recurring | Level 2 | Certificates of deposit |  |  |
Assets |  |  |
Securities available for sale | 732 | 974 |
Recurring | Level 3 |  |  |
Assets |  |  |
Assets at fair value | $ 0 | $ 0 |

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